Abstract
Oxygen-ionic and electronic transport in dense (SrFe) 1− x (SrAl 2) x O z composites, consisting of strontium-deficient Sr(Fe,Al)O 3-δ and SrAl 2O 4 phases, is determined by the properties of perovskite-like solid solution. Increasing the content of SrAl 2O 4, with a total conductivity as low as 5 × 10 − 7 − 10 − 5 S × cm − 1 at 973–1273 K in air, results in the gradual decrease of the partial conductivities, but also enables the suppression of thermal expansion. Compared to single-phase SrFe 1− x Al x O 3-δ, (SrFe) 1− x (SrAl 2) x O z composites exhibit enhanced thermomechanical properties, while the oxygen permeability of these materials has similar values. The composite membranes exhibit stable performance under air/(H 2–H 2O–N 2) and air/(CH 4–He) gradients at 973–1173 K. The oxidation of dry methane by oxygen permeating through (SrFe) 0.7(SrAl 2) 0.3O z results in dominant total oxidation, suggesting the necessity to incorporate a reforming catalyst into the ceramic reactors for natural gas conversion.
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